By-pass valve for locomotive-engines.



0. J. MELLIN. BY-PASS VALVE FOR LOOOMOTIVE ENGINES.

APPLICATION FILED APR.11, 1913-. I v

Patented July 1, 1913.

2 SHEETS-SHEET 1.

unirhDS'rArns PATENT enrich CARL J) mmjnm ,=es 'scnnnnc'rnnv, new YORK.

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To all whom it may concern Be it known that-1,0ARL J. MELLI of.

Schenectady, in the county of Schenectady and State of New York, haveinvented a- 5 certain new and useful Improvement in-By Pass Valves forLocomotive-Engines, of which improvement the followingjis a speci:fication. W

My present invention isan' improvement upon that for. whichLetters-Patent of the United States No." issued to me undert-date ofAugust 3', 1897 j and its object is to a' nsure the practical and theappliance unl der higher steam pressures than those for ,isatisfactoryoperation of which it "was originally designed.

The improvement claimed is hereinafter fully se't forth. j

y In the-accompanying drawings: Figure 1 tion through the same, on theline a a of Fig. 1; and, Fig. 3, a section taken similarly to Fig. 1,illustrating a structural 1 modification,

Referringfirst to Figs. 1 and 2,, in the .practicebf my invention Iprovide a'valve chest or casing, 1, which is connected to the cylinder,2, of a locomotive engine, through lateral tubular branches or nozzles,1*,- each of which communicates with one of the steam induction and'eduction passages, 2, of the cylinder, ball joint rings, 1, beinginterposed to insure properly steam tight joints. The valve chest, 1, isclosed at each end,-by a removable head, 1, secured to the chest bystuds, 1, said headsfitting in the ends of the chest and being bored outat their inner ends to form plunger chambers, 1 of smaller diameterthanthe interior of the chest. Annular steam chambers, 1 are formedaround the plunger chambers, by peripheral grooves in theheads.

Communication between the interior of the valve chest and the cylinderports, 2, 1s

controlled by two by-pass valves, 3, 3, which are in the form of-hollowpistons, closed at 'tl'ieir outer ends, and provided'with peripheralpacking rings, 3, said pistons beingadapted to close on annular seats,;lin the,

' casing, which seats are located on the inner sides of the passagesthrough the tubular branches, 1.' 'Aplu'nger, 3, fitting truly 15 in.the plunger chamber-of the ad acent head,- --isformed upon thefouter endof each of the Specification of'Lette rs Patent, Application filed April11, 1913. Serial No. 76(1394,

- said chambers. A small $87,505 weregranted and" 'is aa verticallongitudinal central section through a by-pass valve appliance embody mg'my invention; Fig. 2, a transverse sec- Patented Ju1y1,1913.

bypass valves, 3,.said plun, ;ers being fitted Wlllh packlng rings, 3!.A steam supply or steam supply, passage of tl1'e locomotive, into eachof the steam supply chambers, 1, and communicates with the plungerchambers,l", through ports, 1', in the walls of 1 which may, if desired,be piped toany ipreferred-location of admission of atmospheric air, isformed in the Wall of the valve .phest, intermediate of the valves, '3,said iportadmitting airat atmospheric pressure, to efiect'the unseat-mgof the by'-pass "valves,

the closure-of the throttle. valves may,

interposedsprmg', as shown-in Letters Patout No 587,505 aforesaid. I j Afloating piston, 5, is fitted in the tub'u; lar body of each'of thevalves, 3, said pisdista'nce apartthat whenthe valves are seated, ,eachpiston will closely adjoin the tion of the valve chest, and pipes, 1,leadpipe, 4', leads from the adjacent valve chest air admission port,-

vwhen the supply of steam to the engine cyl- E inder's anddistribution'valves is cut cit by The bypass if .preferred, beunseatcd-by an tons being connected by a rod, 5 at such a I ing to theexterior of the c linder casting,

are connected to said ports.

In the operation of the appliance, when the locomotive is running withthe throttle valve open, steam from the valve chest is supplied to theplunger chambers,l through the pipes, at, and ports, 1 and acting on theplungers, 3 forces the by-pass valves, 3, to their seats, and cuts oficommunication,

of the pistons,'releases pressure from the atmospheric pressure,entering the valve through the valve chest, between the cylin: derports, 2?. :When. the engine is drifting, or runnin'gvwith throttleclosed, the vacuum produced in the cylinders by the movements outer endsof the plungjers, 3}, and; air at' U chest through the port, ,1,-unse'ats; the

valves, 3, and;.permitsfree circulation ofair, l

der ports,-2. In't h openingfznogteznents ojl t.

through the valve chest, betweern-the' cylim the vala'e'sfthe a nnulajr1 m mbers l the plungrsg' 3fl aiidthe wall of the valve chest performthe function of dash,- pots'for cushioning the valves in theirjunseatinginove- 'I nents,, by .causingthe outer ends of the bodies ofthe valves to come-to rest, without shock, against the inner ends of theheads,

1. A similarcushioning result is. effected,

" in the closing or seating movements of the ingwith the induction andedufction ports' thereof, two byo-pass' val'ves,'eac h seating in saidvalve chest and controlling commumcation between the same'and' one ofsaid ports, said valves" being-nOrmaIIy subject to. and

clcsed by distribution valve chest pressure, means forlunseati ng-"saidvalves upon the relief of suchpiess'ure', and dash pot means said valvesbeing normally subject to an for cushioning jsaid 'va'lves in theirunseating movements.

2.; The combination, with: a locomotive engine cylinder, of a valvechest communicating with the induction and edu'ction ports thereof, twoby-pass valves, each'seating in said valve 'chest and controlling'conimunica-s tion between the-same and one of said ports' closed bydistribution valve chest pressure,

' means for unseating said valves upon the relief of such pressure, dash-pot means for cushioning said valves in their unseating' -1novements,and means, located on the opposite sides of said valves, i fo-rcushlonmg them in their seating movem'en'ts.

3. The comblnation, with a locomotive en,-

gine cylinder, of a valve chest communicat ing with the. induction andeduction ports thereof, heads, each detachably connected to aud closingone end of said valve chest and having." an inwardly projecting plungerchamber, two by-pass valves, each seating in said valve chest, andcontrolhng communication between the same" and one of sald ports,- saidvalves being normally subject to and closed by distributionvalve chestpres-. sure, means forunseating said valves upon municating' with, theinduction andeduction ports thereof, heads, each detachablyifcom nectedto and closing'one end of said valve chest, and having .an inwardlyprojecting plungerchamber surrounded by an annularstea-m chamber, a'pipefornormallyestab lishing communication between said steam chambers and adistribution valve chest of the locomotive, two by-pass valves, eachseating 1n the' by-pass .valve chest and controlling communicationbetween the same-and one of, the cylinder ports, means for unseat-. ,ingsaid valves upon the relief of pressure in thesteam'chambers, andplungers fixed on-said valves and fitting the plunger chamber.

, 5L The combination, with a locomotive engine cylinder, of a valvechest communicatmg with the induction and eduction ports thereof, twotubular "by-pass valves, each vseat-ing'in said valve chest, andcontrolling communication between the same and one. ,of said. ports,said valves being normally subject to and closed by distribution valvechest pressure, means for unseating said valves upon the relief of suchpressure, dash pot means for cushioning said valves in their unseatmgmovements, and connected float-' mg plstons, each fitting in one, of thetubular by-pass valves.

. CARL J. MELLIN. Witnesses:

-ROBERT F. HALL, E. I. SCIIAUBER.

Copies of this-patent may be obtained for five cents each, by addressingthe Commissioner of Patents.

WaShington D. C.

